On 4/28/20 5:41 PM, Eric Sandeen wrote: > This seems ... large, no? > > # /usr/bin/time -f "RSS %M kb" ./fio --name=writetest --filename=/mnt/testfile1 --rw=write --bs=4096 --size=64M --iodepth=1 --ioengine=libaio --direct=1 --verify=sha512 --do_verify=0 > > RSS 1138748 kb > > and it got quite a bit larger with commit > > df8781b6 fio: groundwork for adding slat, lat percentiles > > i.e. if I check out the commit just before that, > > ab45cf07 Merge branch 'stat-averaging-interval-start-fix' of https://github.com/maciejsszmigiero/fio > > I get: > > RSS 782236 kb > > which is, if I'm reading it right, ~350mb smaller. > > 760mb seems pretty big for a simple fio job like this in the first > place, that commit growing it by 350mb is unexpected and I ... haven't > been able to figure out where that increase came from. Am I > mis-analyzing something here? It probably got larger with that commit because it added to the thread_data, and fio defaults to a large number of jobs... You can try and add: --max-jobs=X to shrink the max jobs it supports, that'll reduce it drastically. I think we default to 4k of jobs by default, or something like that, and each job will consume ~274K. -- Jens Axboe
